Audi Q8, SQ8, RS Q8, 4MN / 4MT (USA)

Differential fluid capacity & service interval

Audi Q8, SQ8, RS Q8, 4MN / 4MT (USA) differential fluid capacities range from 0,85 to 1,5 liters. Service intervals include checks every 20000 miles or 24 months and changes every 60000 miles. The data covers 10 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
  • RS Q8 4.0 TFSI quattro (441 kW) (2019-2024)
  • Front
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,9 liter (Refill)
  • Check 20000 miles/ 24 months
  • RS Q8 4.0 TFSI quattro (441 kW) (2019-2024)
  • Rear
  • Use: Normal
  • Capacity 1,5 liter (Initial fill)
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0BX
  • RS Q8 4.0 TFSI quattro (441 kW) (2019-2024)
  • Rear
  • Use: Normal
  • Capacity 0,85 liter (Initial fill)
  • Check 20000 miles/ 24 months
  • Code: 0DG
  • RS Q8 4.0 TFSI quattro (441 kW) (2019-2024)
  • Rear, outer sections
  • Use: Normal
  • Capacity 1,2 liter (Initial fill)
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0BX
  • SQ8 4.0 TFSI quattro (373 kW) (2019- )
  • Front
  • Use: Normal
  • Capacity 1 liter (Dry fill)
  • Capacity 0,9 liter (Refill)
  • Check 20000 miles/ 24 months
  • SQ8 4.0 TFSI quattro (373 kW) (2019- )
  • Rear
  • Use: Normal
  • Capacity 1,5 liter (Initial fill)
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0BX
  • SQ8 4.0 TFSI quattro (373 kW) (2019- )
  • Rear
  • Use: Normal
  • Capacity 0,85 liter (Initial fill)
  • Check 20000 miles/ 24 months
  • Code: 0DG
  • SQ8 4.0 TFSI quattro (373 kW) (2019- )
  • Rear, outer sections
  • Use: Normal
  • Capacity 1,2 liter (Initial fill)
  • Check 20000 miles/ 24 months
  • Change 60000 miles
  • Code: 0BX
  • Q8 55 TFSI quattro (250 kW) (2018- )
  • Front
  • Use: Normal
  • Capacity 1 liter (Initial fill)
  • Capacity 0,9 liter (Refill)
  • Check 20000 miles/ 24 months
  • Q8 55 TFSI quattro (250 kW) (2018- )
  • Rear
  • Use: Normal
  • Capacity 0,85 liter (Initial fill)
  • Check 20000 miles/ 24 months
  • Code: 0G2

Additional Notes

  • The front differential on the Audi Q8 55 TFSI quattro carries a 1-liter initial fill capacity, while the refill capacity drops to 0.9 liter, reflecting the difference between a fully drained housing and a partial service top-up.
  • The Q8 55 TFSI quattro rear differential holds 0.85 liter at initial fill, with no separate refill figure listed, and no scheduled fluid change interval, only a check at 20,000 miles or 24 months.
  • The RS Q8 4.0 TFSI quattro and SQ8 4.0 TFSI quattro share identical front differential capacities of 1 liter dry fill and 0.9 liter refill, along with the same 20,000-mile or 24-month check interval.
  • A dry fill designation on the front differential of the RS Q8 and SQ8 variants indicates a capacity measured from a completely empty housing, as opposed to the initial fill label used on the Q8 55 TFSI quattro, which may account for residual fluid.
  • The RS Q8 4.0 TFSI quattro rear differential lists two separate initial fill values: 1.5 liters for one configuration and 0.85 liter for another, indicating two distinct rear differential assemblies are covered under the same model designation.
  • The SQ8 4.0 TFSI quattro rear differential mirrors the RS Q8 rear differential specifications exactly, with the same 1.5-liter and 0.85-liter initial fill figures across two separate configurations.
  • Both the RS Q8 and SQ8 rear differential configurations rated at 1.5 liters carry a mandatory fluid change at 60,000 miles, a requirement absent from the 0.85-liter rear differential configuration on the same models.
  • The rear outer sections of the RS Q8 and SQ8 differentials are listed as a distinct service point, each requiring 1.2 liters at initial fill and a fluid change at 60,000 miles alongside the standard 20,000-mile or 24-month check.
  • Across all configurations in the specifications, the front differential check interval is consistently set at 20,000 miles or 24 months under normal use conditions, with no change interval specified for any front differential.

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